Which of the following polygon has no diagonal?

Quadrilateral

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Heptagon

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Triangle

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Pentagon

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Solution

The correct option is D Triangle
A diagonal is a line segment joining two opposite vertices. Since we cannot have diagonal to the vertex of either side, as it would lay on top of a side. Hence triangle being only 3 sides, each vertex joining vertex is its own side. So there are no diagonals in a triangle.
Therefore, C is the correct answer.

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